Abstract
Slope instability under dynamic load is the technical difficulty in the engineering; the evaluation of slope stability under dynamic load and the control of dynamic load is particularly important. In this paper, taking the right side slope of K27+140 m~380 m typical section (K27 slope for short) in Chongqing Fuling-Fengdu-Shizhu expresses highway as an example to calculate and analyze. The K27 slope is under sinusoidal vehicle load and supported by anchor cable and antislide pile to resist downslide strength; at the same time, the combined effect of them is studied. Three-dimensional finite element methodology (FEM) is used to simulate the bedding slope with piles and anchor cable support; furthermore, the eigenvalue can be obtained. In order to reduce error of the elastic boundary conditions caused by the reflection effect of wavelengths, the combination of Lysmer surface viscous boundary and traditional ground support boundaries is utilized to analyze and calculate the time-histories during bedding slope under dynamic load. The dynamic response of pile anchor support to resist sliding force is obtained. The concept of the pile anchor supporting coordinate interval is put forward. Furthermore, it is verified that the pile anchor supporting coordinate interval can be used to evaluate the stability of the slope under dynamic load and provide a new method for the control of the dynamic load.
Highlights
Anchor pile support has been widely used in slope engineering
According to the real-time monitoring data of slope, the internal force of anchor or antislide pile is within the reasonable coordinate interval, which means that the slope is safe; yet, if the force is out of it, that means overload causes compressive stress redistribution, increasing the possibility of landslide, which must be brought to the forefront
Based on the simulation of sine wave vehicle load acting on the bedding slope, the surface viscous boundary proposed by Lysmer and conventional ground support boundary are united to calculate the eigenvalue and time-histories, reaching the dynamic response of anchor pile composite structure, proposing the conception of reasonable coordinate interval under dynamic load
Summary
Methods of slope stability evaluation with the pile anchor supporting are not diverse. Le et al [2] use the software, ABAQUS, to simulate and analyze the stability of foundation pit supporting structure system under traffic dynamic load, drawing the conclusion that horizontal displacement of retaining piles and the changing rule of the axial force of anchor bolt accords well with the numeric simulation results. The bedding slope supported by anchor pile on the highway, Chongqing section of K27+140∼27+380, is conducted by the free vibration analysis, to reach the dynamic characteristics, using which to analyze dynamic response of the combination of anchor cable with frame beam and antislide pile under sine wave load. Planar and sectional drawings of K27 slope are shown in Figures 1 and 2
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